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Kenmore window ac unit type Freon

I have an old Kenmore window unit(15 + years old) 110V The unit has no lable or model number
that I can find. I need to know what type Freon these units used. The unit is probably 8K BTUH
unit and I want to add freon to it because it is built into a wall and I don't want to take it out if I can fix it. This is a shot in the dark but I'm hoping someone recalls whether these units used F12 or F22

First: I am not asking anyone to tell me how to fix anything.
Second: I can fix it legally if I want to. I have had an unrestricted H&AC license here in Georgia since 1957 and I attend schools every year as required to keep it.
Third: I understand it is uneconomical for me to repair it but I have my reasons. People spend tons of money to fix 1935 Fords etc. which have surely served their purpose.
If you can't answer the question why give me a lesson based on your asumptions.
Thank all of you for the replies anyway .

The plate should be one the right side of the case as you are facing it. It sounds like it is covered up because it is built in. If you've been in the business that long, you know when R12 got fazed out. I would think a 500 series would be a more likely odd ball to find in a 15 plus year old unit. But I haven't seen one.

There is no name plate on the case. A name plate is down on the side of the compressor but it was not filled out.
There is a 1" X 5" receiver in the suction line before it goes into the compressor. The receiver has the number 12 stenciled in white on its side. The compressor also has a 12 stenciled on the top.
In the absence of other information I am assuming that the the unit was charged with F12
This thing may be much older than 15 years. It is big and heavy, made in the USA and has about three times the coil size of the Chinese stuff we get now. A leak has been repaired and it is holding a vacumm
while on life support. Like someone said its not worth fixing but I'm having fun. Thank U all

There is no name plate on the case. A name plate is down on the side of the compressor but it was not filled out.
There is a 1" X 5" receiver in the suction line before it goes into the compressor. The receiver has the number 12 stenciled in white on its side. The compressor also has a 12 stenciled on the top.
In the absence of other information I am assuming that the the unit was charged with F12
This thing may be much older than 15 years. It is big and heavy, made in the USA and has about three times the coil size of the Chinese stuff we get now. A leak has been repaired and it is holding a vacumm
while on life support. Like someone said its not worth fixing but I'm having fun. Thank U all

If there's a "receiver" in the suction line, it's typically called an accumulator. Receivers can't work in a suction line because there is no liquid in that line (or at least there should not be any liquid there!).

Since you have no helpful info for that unit it's then a crapshoot what to do regarding the charge. You could shoot some R12 in there (you happen to have some of that sitting around?) and watch your gauges, superheat, and subcool. No go, you could then repeat with R22. The "12" you see stamped on there could mean anything, from R12 to a way to identify the compressor with the device in the suction line. Who knows?

Electricity makes refrigeration happen.

Refrigeration makes the HVAC psychrometric process happen.

HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.